I'm hosed 我完蛋了

例句：

I am hosed. My mom found out I skipped school last week.

这下惨了，我妈发现我上周翘课了。

Hang in there 坚持下去

例句：

Hang in there. I am sure things will work out in the end.

坚持住，我相信问题最后解决的。

Since when 从什么时候起（太阳打西边出来了）

例句：

Since when have you been interested in my opinion?

你啥时候起也开始关心我的意见了？

Dressed to kill 打扮迷人

例句：

She must be trying to impress him. She is dressed to kill.

她一定花了很大心思要引他注意，穿得这么花枝招展。

It totally slipped my mind 完全忘记要做的事

例句：

There was something I needed to do today but it totally slipped my mind.

我今天有个什么事要做，但是我完全想不起来了。

Let's go fifty-fifty 平分账单

例句：

Let's split the tab for drinks fifty-fifty.

喝酒的账单咱们平分吧。

Good for nothing 一无是处

例句：

That girl is a good for nothing troublemaker.

那姑娘就是个一无是处的捣乱鬼。

You bet 当然；肯定地

例句：

You bet I'll be at your game. I would not miss it.

我当然会去看你的比赛，绝对不会错过。